diff --git a/requirements.txt b/requirements.txt
index 4e0f8dc0..78077b01 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -10,6 +10,6 @@ pyflakes==1.6.0
 
 # Testing
 # ------------------------------------------------------------------------------
-tox==2.9.1
+tox==3.0.0
 pytest==3.5.0
 pytest-cookies==0.3.0